Store HValue uses in a custom small list structure.

src/hydrogen.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 725 matching lines @@
 
     // Skip phi node if it was already replaced.
     if (block == NULL) continue;
 
     // Get replacement value if phi is redundant.
     HValue* value = phi->GetRedundantReplacement();
 
     if (value != NULL) {
       // Iterate through uses finding the ones that should be
       // replaced.
-      ZoneList<HValue*>* uses = phi->uses();
+      SmallPointerList<HValue>* uses = phi->uses();
       while (!uses->is_empty()) {
         HValue* use = uses->RemoveLast();
         if (use != NULL) {
           phi->ReplaceAtUse(use, value);
           if (use->IsPhi()) worklist.Add(HPhi::cast(use));
         }
       }
       block->RemovePhi(phi);
     }
   }
@@ skipping 5199 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify();
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal